Door-check.



No. 810,021. PATENTED JAN. 16, 1906. L. AUDRIETH.

DOOR CHECK.

APPLICATION FILED DBO. 24. 1904.

PATENT orrron.

LUDWIG AUDRIETH, `OF NEW YORK, N. Y.

DOOR-CHECK.

Specification of Letters Patent.

Patented Jan. 16, 1906.

Application filed December 24, 1904. Serial No. 238,182.

To all whom, t may concern:

Be it known that I, LUDWIG AUDRIETH, a citizen of the United States,residing in New York, borough of Manhattan, in the State of New York,have invented certain new and useful Improvements in Door Checks, ofwhich the following is a specification. A

This invention relates to improvements in door-checks known as liquiddoor-checks, in which a fluid is employed to secure the easy closing ofthe door and to resist the power of the door-spring, the object being toproduce the effective working of the check and a cushioning action ofthe fluid against the tension of the door-spring during the closing ofthe door; and with these ends in view the invention consists of adoor-check which embodies the novel features and combination of parts tobe fully described hereinafter and finally pointed out in the claims.

In the accompanying drawings, illustrative of one embodiment of theinvention, Figure l isa horizontal section showing the connection of myimproved door-check with the door and door-casing, the dotted linesindicating the position of the parts when the door is opened. Fig. 2 isa side elevation of the improved door-check, partly in section. Fig. 3is a vert-ical central section of the same on line 3 3, Fig. 2, Fig. 4is a top view of Fig. 8; and Fig. 5 is a horizontal section on line 5 5,Fig. 3.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, a designates a cylindrical casing which isprovided with exterior flanges a, cast integral therewith, by means ofwhich said casing is attached to the door in the usual manner. Thecasing is closed at the bottom and open at the top, the bottom beingprovided with a central depression which forms a step-bearing for thespindle b, that is supported centrally in the casing. The top of thecasing a is closed by a cover d, which is provided with a stuffingbox d.The intermediate portion of the spindle between the bottom and cover issquare in cross-section, while the lower end and the upper end, thatprojects through the cover and stuffing-box, are circular incrosssection, so that the spindle turns loosely in the bottom and coverof the casing.` The upper end of the spindle is extended above thestuffing-box d and made square, as at b, so as to be connected with thesplit end of the lever j, which is attached to the square end b by asuitable clamping-screw and connected at its outer end by a suitablelink f with the door-casing in the usual manner, as shown in Fig. 1. Onthe square upper end b of the spindle and resting on the upper end ofthe rounded neck portion of the same is placed a hexagonal collar b2, bywhich the spiral spring 7L, coiled about the spindle, is

set to proper tension for applying the lever f to the upper end t of thesame. When the lever is removed, the spring h is returned to its normalposition. The helical spring rests with its lower end at the interior ofa hollow plun er g, the square central socket gf of whic is slidable onthe spindle, said plunger being provided on its outer surface with ahelical thread or rib which engages a helical groove formed in the innerwall of the casing, so as to turn with the spindle, but be movedsimultaneously in an upward direction. The plunger is provided in itsbottom with elongated openings i, which are closed by a springactuatedring-shaped valve 7c, that extends around a boss at the bottom of theplunger, as shown in Figs. 2 and 3. When an extra tension is required, asecond helical spring 7L is arranged within the larger spring h, asshown in Fig. 3, The lower end of the casing is connected by a radialboren with an exterior tube a', which may be cast at its upper and lowerends into the casing or inserted into bores in the same, said tube beingconnected at its upper end by a lateral bore n2 with the interior of thecasing below the cover, the cover being tightly screwed into the upperend of the casing. The upper ends of the helical springs h 7L bear on asheetmetal washer t, interposed between the under side of the cover andthe upper ends of the springs, as shown in Fig. 3, so as to take up thefriction of the springs with the under side, of the cover. Forincreasing or decreasing the size of the bore n2 an adjustable plug o isemployed in order to accelerate or retard the .flow of oil or'otherliquid in the casing through the bore n2 back into the casing, wherebythe do'or can be made to close with the desired rapidity. When thedoor-check is in use, the interior of the casing is partly filled withoil or other liquid. When the casing is turned with the door in thedirection of the arrow, as shown in Figs. 1 and 5, on opening the doorthe spindle is turned on its axis by the lever f. This produces theupward motion of the plunger on the spindle in the helical interiorgrooves of the casing, so that the pressure IOO exerted on the liquid bythe upward motion of the plunger opens the valves ybelow the plunger andforces the oil through the bottom openings in the plunger and into thelower part of the casing, while simultaneously the door spring orsprings are set to tension. As soon as the door is released the actionof the springs regaining their former position produces the return ofthe plunger and the turning of the spindle, so as to exert by theconnecting-leverf and link f the gradual closing of the door, which isretarded by the resistance of the oil in the lower part of the casing,

which is forced by the plunger slowly through the lower bore n tubularchannel n, and upper bore n2 back into the upper part of the casing. Theclosing of the door can be more or less retarded by adjusting the sizeof the opening of the bore by means ol the screwplug 0.

When the door-check is to be applied t'o a door opening in the oppositedirection to that shown in Fig. l, the spring or springs as well as theplunger g have to be set in position corresponding to the motion of thecsaing, so that the same check is applicable to doors opening left orright. The tension of the spring or springs is adjusted to greater orless extent by means of a wrench applied to the hexagonal collar b2 atthe upper square end of the spindle, said spindle being held in therequired position until the lever has been attached thereto, when thewrench is removed and the door-check in position Jfor regular actionafter the screw-plug that regulates the size of the upper bore has beenplaced in proper position.

Having thus described my invention, I claim as new and desire to secureby Letters Patent* 1. In a door-check, the combination, with a casing,of a spindle turning in step-andneck bearings in the bottom and cover ofsaid casing, the intermediate portion of said spindle being square incross-section, a plunger provided with a square socket slidable on theintermediate portion of said spindle and with bottom openings, andhaving an exterior thread or rib guided in helical grooves formed in theinner wall of the casing, a spring-actuated valve below said bottomopenings, a helical spring interposed between the plunger and cover, anda regulable channel connecting the lower portion of the casing with theupper portion thereof.

2. In a door-check, the combination, with a casing attached to the door,of a rotatable spindle turning in step-and-neck bearings in the bottomand cover of said casing, a plunger provided with a square socket guidedon said spindle and with openings extending therethrough, said plungerhaving an exterior rib guided in helical grooves formed in the innerwall of the casing, a spring-actuated valve below said plunger-openings,a helical spring interposed between the plunger and cover, a channelconnecting the lower portion of the casing below the plunger with theupper portion thereof above said plunger, and a screw-plug 'forregulating the passage of liquid through said channel.

3. The combination, with a door, of a casing attached to the door, aspindle supported in step-and-neck bearings in the bottom and cover ofsaid casing, said spindle being square in cross-section within thecasing and having endsof circular cross-section rotatable in the bottomand cover, and a square upper end provided with an adjusting-column, aconnecting-lever applied to the outer square ends of said spindle, alink connecting the outer end of said lever with the door-casing, aplunger guided by a rib in helical grooves formed in the inner`wall ofsaid casing and slidable on the square portion of said spindle, and ahelical spring interposed between said plunger and the cover of saidcasing.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

LUDWIG AUDRIETI'I.

Witnesses:

PAUL GOEPEL, HENRY J. SUHRBIER.

